Question 1

The most frequently encountered biological stains found at a crime scene are blood, seminal fluid, and saliva.

Accepted Answer

These biological stains are commonly found at crime scenes and are often tested for DNA analysis.

Question 2

Urine tests may provide a timeline that indicates drug use over a long period of time.

Accepted Answer

Urine tests typically detect drug use within a short window of a few days to a week, depending on the substance, rather than over a long period of time.

Question 3

The most common confirmatory test is the gas chromatography\ mass spectrometry (GC\MS) test.

Accepted Answer

The GC/MS test is considered the most accurate and reliable confirmatory test for drug testing.

Question 4

Identical twins have the same genetic makeup

Accepted Answer

Identical twins develop from a single fertilized egg and therefore have the same genetic information.

Question 5

CODIS, Combined DNA Index System, contains DNA profiles of all individuals incarcerated since 1998.

Accepted Answer

CODIS contains DNA profiles not only of incarcerated individuals but also of individuals who have been arrested, convicted but not incarcerated, and even individuals who provided their DNA voluntarily. Furthermore, CODIS was established in 1994, not 1998.

Question 6

Serology is the analysis of the properties and effects of&#10;A) blood, urine, tissues, organs, and sweat&#10;B) semen, blood, saliva, sweat, and fecal matter&#10;C) DNA, blood, urine, sweat, and saliva&#10;D) none of the above

Accepted Answer

Serology typically involves the analysis of bodily fluids such as blood, saliva, semen, sweat, and fecal matter. Option A includes some bodily fluids but also includes tissues and organs, which are not typically analyzed in serology. Option C includes DNA, which may be analyzed in conjunction with serology, but is not typically analyzed on its own within the field of serology. Option D is incorrect as serology is a valid scientific field.

Question 7

At the crime scene, the most frequently encountered biological stains are&#10;A) urine, blood, and sweat&#10;B) blood, saliva, and sweat&#10;C) blood, seminal fluid, and saliva&#10;D) none of the above

Accepted Answer

Blood, seminal fluid, and saliva are the most frequently encountered biological stains at a crime scene, as they can provide valuable DNA evidence to help identify suspects or victims. Urine and sweat are less commonly encountered, and while they can also contain DNA, they are more difficult to collect and analyze.

Question 8

Toxicology is the study of&#10;A) DNA and blood to determine the presence of drugs or poisons&#10;B) body fluids to determine the presence of drugs or poisons&#10;C) organs and tissues to determine the presence of drugs or poisons&#10;D) body fluids, tissues, and organs to determine the presence of drugs or poisons

Accepted Answer

Toxicology involves the study of the presence and effects of drugs and poisons in the human body. This includes examining body fluids, tissues, and organs to determine the extent of exposure and potential harm caused by a substance. Therefore, the best choice is D - body fluids, tissues, and organs to determine the presence of drugs or poisons.

Question 9

A confirmatory test for the presence of drugs or poisons is done&#10;A) at the crime lab using a GC\MS&#10;B) at the crime scene by the CSI&#10;C) at the crime lab using alternative light sources&#10;D) at the crime scene by a forensic scientist

Accepted Answer

Confirmatory tests require a high level of accuracy and sensitivity, which can only be achieved through the use of sophisticated laboratory equipment such as gas chromatography/mass spectrometry (GC/MS). This type of equipment is typically found in crime labs, and requires specialized training to operate. Testing at the crime scene, by contrast, is typically limited to preliminary screening tests which may be less accurate and may require confirmation by more precise equipment in the lab. Alternative light sources may be used to detect other types of evidence (such as bloodstains or fingerprints), but are not typically used to confirm the presence of drugs or poisons. Forensic scientists may conduct confirmatory tests in the lab, but this is not typically done at the crime scene.

Question 10

Physical evidence that can provide a timeline indicating drug use over a long period is&#10;A) urine&#10;B) hair&#10;C) blood&#10;D) perspiration

Accepted Answer

Hair can provide a timeline of drug use that dates back several months or even years, as drugs become incorporated into the hair shaft as it grows. Urine, blood, and perspiration only indicate drug use within a shorter timeframe of hours to days.

Question 11

Who discovered the first deoxyribonucleic acid (DNA) &#34;fingerprints?&#34;&#10;A) Sir Daniel Moeser&#10;B) Sir Alex Baldwin&#10;C) Sir Alec Jeffreys&#10;D) Sir Alan Jefferson

Accepted Answer

The answer of Who discovered the first deoxyribonucleic acid (DNA)...

Question 12

A(n) _____________ test is conducted at the crime scene to indicate the possibility of blood.&#10;A) presumptive&#10;B) initial&#10;C) first&#10;D) blood

Accepted Answer

The answer of A(n) _____________ test is conducted at the...

Deck 6: Body Fluid Evidence